在C＃中使用xmlnamespacemanager添加命名空间

我正在尝试从XML文件中读取数据。 在这个元素中加上’app’和’gml’文本的前缀。 因为这些前缀我无法读取数据。 为此，我试图通过使用XMLNamespaceManager添加命名空间，但没有得到。

编辑：

XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(new StringReader(strResult)); NameTable nt = new NameTable(); XmlNamespaceManager prefix = new XmlNamespaceManager(nt); string nmspc = xmlDoc.DocumentElement.NamespaceURI; prefix.AddNamespace("app:",xmlDoc.DocumentElement.NamespaceURI); prefix.PushScope(); 

这里strResult包含XML数据

Answer 1

就像是：

 var doc = new XmlDocument(); doc.Load(source); var nsmgr = new XmlNamespaceManager(doc.NameTable); nsmgr.AddNamespace("app", "http://www.weather.gov/forecasts/xml/OGC_services"); var firstPoint = doc.SelectSingleNode("//app:Forecast_Gml2Point", nsmgr); 

请注意，命名空间别名只是方便，并且不必在文档和命名空间管理器之间进行匹配 – 但如果它们可能更容易。

Answer 2

您可以使用LINQ-to-XML，如下所示：

 var document = XDocument.Load("http://www.weather.gov/forecasts/xml/SOAP_server/ndfdXMLclient.php?whichClient=GmlLatLonList&lat=&lon=&listLatLon=&lat1=&lon1=&lat2=&lon2=&resolutionSub=&listLat1=&listLon1=&listLat2=&listLon2=&resolutionList=&endPoint1Lat=&endPoint1Lon=&endPoint2Lat=&endPoint2Lon=&listEndPoint1Lat=&listEndPoint1Lon=&listEndPoint2Lat=&listEndPoint2Lon=&zipCodeList=&listZipCodeList=&centerPointLat=&centerPointLon=&distanceLat=&distanceLon=&resolutionSquare=&listCenterPointLat=&listCenterPointLon=&listDistanceLat=&listDistanceLon=&listResolutionSquare=&citiesLevel=&listCitiesLevel=&sector=&gmlListLatLon=38.99,-77.02%2039.70,-104.80%2047.6,-122.30&featureType=Forecast_Gml2Point&requestedTime=&startTime=2000-01-01T00:00:00&endTime=2012-01-01T00:00:00&compType=Between&propertyName=wx,temp,icons&product=time-series&begin=2004-01-01T00:00:00&end=2015-06-07T00:00:00&maxt=maxt&Submit=Submit"); var appSampleElements = document.Descendants(XName.Get("Forecast_Gml2Point", "http://www.weather.gov/forecasts/xml/OGC_services")).ToList(); var gmlSampleElements = document.Descendants(XName.Get("Box", "http://www.opengis.net/gml")).ToList(); 

使用“http://www.weather.gov/forecasts/xml/OGC_services”命名空间用于那些以app为前缀的命名空间。 对于那些以gml为前缀的命名空间，请使用“http://www.opengis.net/gml”命名空间。

使用XmlDocument：

 XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load("http://www.weather.gov/forecasts/xml/SOAP_server/ndfdXMLclient.php?whichClient=GmlLatLonList&lat=&lon=&listLatLon=&lat1=&lon1=&lat2=&lon2=&resolutionSub=&listLat1=&listLon1=&listLat2=&listLon2=&resolutionList=&endPoint1Lat=&endPoint1Lon=&endPoint2Lat=&endPoint2Lon=&listEndPoint1Lat=&listEndPoint1Lon=&listEndPoint2Lat=&listEndPoint2Lon=&zipCodeList=&listZipCodeList=&centerPointLat=&centerPointLon=&distanceLat=&distanceLon=&resolutionSquare=&listCenterPointLat=&listCenterPointLon=&listDistanceLat=&listDistanceLon=&listResolutionSquare=&citiesLevel=&listCitiesLevel=&sector=&gmlListLatLon=38.99,-77.02%2039.70,-104.80%2047.6,-122.30&featureType=Forecast_Gml2Point&requestedTime=&startTime=2000-01-01T00:00:00&endTime=2012-01-01T00:00:00&compType=Between&propertyName=wx,temp,icons&product=time-series&begin=2004-01-01T00:00:00&end=2015-06-07T00:00:00&maxt=maxt&Submit=Submit"); XmlNamespaceManager namespaceManager = new XmlNamespaceManager(xmlDoc.NameTable); namespaceManager.AddNamespace("app", "http://www.weather.gov/forecasts/xml/OGC_services"); namespaceManager.AddNamespace("gml", "http://www.opengis.net/gml"); var appNodes = xmlDoc.SelectNodes("//app:Forecast_Gml2Point", namespaceManager); var gmlNode = xmlDoc.SelectSingleNode("//gml:Box", namespaceManager);